[Bug libstdc++/67015] "^[a-z0-9][a-z0-9-]*$", std::regex::extended is miscompiled

[doko at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67015

--- Comment #1 from Matthias Klose <doko at gcc dot gnu.org> ---
Created attachment 36056
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36056&action=edit
regex2.cc